<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <title>Title</title>
</head>
<body>
    <div id="app">
        <p>{{msg}}</p>
    </div>


    <script>
      var app = new Vue({
          el:'#app',
          data:{
              msg:'Hello！'
          }
      })
    </script>
</body>

</html>